Blockchain Exam CBDE Topic 2 Question 72 Discussion

Actual exam question for Blockchain's CBDE exam

Question #: 72
Topic #: 2

[All CBDE Questions]

When you do external calls to other smart contracts:

Ayou should follow the checks-effects-interactions pattern and avoid state changes after the call.

Byou should follow the effects-checks-interactions pattern and avoid state changes before the call.

Cyou should follow the checks-effects-interactions pattern, which is only necessary when you do calls to contracts where a direct contract call is not possible.

Show Suggested Answer

Suggested Answer: B

by Dominque at Jul 04, 2023, 02:02 AM

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Martha

29 days ago

I'm just going to write 'All of the above' and hope the grader is in a good mood. Navigating these Solidity patterns is like trying to solve a Rubik's Cube blindfolded.

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Kimberlie

15 days ago

User 1: A) you should follow the checks-effects-interactions pattern and avoid state changes after the call.

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Tasia

1 months ago

Wait, so we have to do a dance before, during, and after the external call? This exam is turning into the Hokey Pokey!

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Ahmed

2 days ago

Haha, it does sound like a dance routine, but it's just a way to ensure the safety and efficiency of your smart contract interactions.

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Elmer

4 days ago

C) you should follow the checks-effects-interactions pattern, which is only necessary when you do calls to contracts where a direct contract call is not possible.

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Martha

5 days ago

A) you should follow the checks-effects-interactions pattern and avoid state changes after the call.

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Callie

5 days ago

A) you should follow the checks-effects-interactions pattern and avoid state changes after the call.

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Roslyn

2 months ago

I think Option C is the right answer. The checks-effects-interactions pattern is only necessary when you can't directly call the other contract. Otherwise, it's overkill.

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Gladys

11 days ago

B) you should follow the effects-checks-interactions pattern and avoid state changes before the call.

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Luann

14 days ago

C) you should follow the checks-effects-interactions pattern, which is only necessary when you do calls to contracts where a direct contract call is not possible.

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Claudia

1 months ago

A) you should follow the checks-effects-interactions pattern and avoid state changes after the call.

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Clorinda

2 months ago

I'm not sure about that 'effects-checks-interactions' thing. Isn't it better to just avoid state changes altogether when making external calls?

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Tarra

5 days ago

A) you should follow the checks-effects-interactions pattern and avoid state changes after the call.

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Camellia

23 days ago

A) you should follow the checks-effects-interactions pattern and avoid state changes after the call.

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Lashawn

1 months ago

C) you should follow the checks-effects-interactions pattern, which is only necessary when you do calls to contracts where a direct contract call is not possible.

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Derrick

1 months ago

B) you should follow the effects-checks-interactions pattern and avoid state changes before the call.

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Margart

2 months ago

A) you should follow the checks-effects-interactions pattern and avoid state changes after the call.

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Mitzie

2 months ago

But what about option C? It says it's necessary for calls to contracts where a direct contract call is not possible.

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Renea

2 months ago

I agree with Polly, it helps to avoid state changes after the call.

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Percy

2 months ago

Option A is definitely the way to go. Following the checks-effects-interactions pattern is crucial to avoid reentrancy vulnerabilities.

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Kaitlyn

24 days ago

User 2: I agree, following the checks-effects-interactions pattern is crucial to avoid reentrancy vulnerabilities.

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Devon

1 months ago

User 1: Option A is definitely the way to go.

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Polly

2 months ago

I think when doing external calls, we should follow the checks-effects-interactions pattern.

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Veta

2 months ago

I think both options have their merits, but I prefer following the checks-effects-interactions pattern, especially when direct contract calls are not possible.

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Dick

2 months ago

I disagree, I believe we should follow the effects-checks-interactions pattern and avoid state changes before the call.

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Tayna

2 months ago

I think when doing external calls, we should follow the checks-effects-interactions pattern and avoid state changes after the call.

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